--- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Sun, Feb 26, 2017 at 12:04 PM, Internet <[email protected]> wrote: > Yeah, that is true. But the one on PCB1 only cuts power for the USB A > ports. > ah! then i'm thinking of the microdesktop, and haven't looked at PCB1 recently enough to remember that. i have a vague recollection of deciding to move bidirection power-provision to PCB3. > It does not act as power switch for the card to provide charging > capability. To do that you need two of them on PCB3. One has 5v from the > battery as input and the 5v ports of the eoma68 card as output, the other > one has the 5v ports from the card as input and the output should be wired > to the input of the usb otg charger ic (through a diode otherwise 12v would > damage the card). If a usb otg cable is plugged in and the computing card > switches the two complementary sy6280, power would go into the usb charger > ic and charge the battery which also powers the rest of the system. Power > from the system to the computing card would be off because the switch is > open. > > However, it won't charge from the card, if the 12v adapter is plugged in > (because of the protection diode). > > I will clarify this on the pcbs page but at the moment I don't have access > to a PC. > > honestly... it would be best done as a diagram, even if it's hand-drawn and then photographed. i recall tracking down the LT4155 (and then the bq24193 as its replacement) precisely so that external components such as the SY6280's and extra protection diodes *wouldn't be needed*. grrr :) i _would_ suggest using the AXP209 or something else from X-Powers but i don't believe they can handle this much current (4 to 5 Amps) - certainly the AXP209 can only handle around 2A. *sigh*... l.
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